Creep Crack Growth Modelling in 316H Stainless Steel

Prediction of creep crack initiation behaviour in 316H stainless steel using stress dependent creep ductility

“…When an element is considered fully creep damaged, the crack growth is simulated by reducing the load carrying capacity of that element. This approach has been widely used in CCG and CCI simulations [3], [12], [13], [22], [32], [21], [33]. The creep damage model used in the FE simulations is described next and has been implemented in the subroutine.…”

“…Since components are usually subjected to relatively low load levels compared with those applied in accelerated short-term tests, the new estimated trends presented in [12] provide a more accurate approach for the analysis and design of high temperature components operating at low stresses. The stress dependent creep ductility trends developed in [12] were implemented in finite element (FE) simulations to predict 4 the CCG behaviour in compact tension, C(T), 316H specimens, and good agreements were found between FE predictions and experimental data [12], [13].…”

Numerical Prediction of the Long Term Creep Crack Growth Behaviour in Type 316H Stainless Steel

“…Following the procedures detailed in [4], two dimensional (2D) CCG simulations have been performed on a compact tension, C(T), geometry of width W = 50 mm and the initial normalised crack length of a 0 /W = 0.5. Creep damage has been modelled using the ductility exhaustion approach in which the multiaxial creep ductility, * f ε , has been obtained from the Cocks and Ashby…”

“…In this new method the creep ductility trends have been estimated as a function of the applied stress normalised by the temperature dependent 0.2% proof stress of the material, σ/σ 0.2 , to include the plasticity effects on the creep deformation behaviour of the material. These trends have been implemented in finite (FE) simulations to predict the CCG behaviour of 316H in intermediate and long term tests at 550 °C and provisional results are presented in [4].…”

“…This is thought to be due to the reduction in creep ductility and also hardening effects in the PC material [5]. Assuming that the creep ductility trends of the AR and PC materials are similar when correlated with σ/σ 0.2 , CCG simulations have been performed on PC material and the results are compared to those of obtained from AR material in [4]. In this paper, further lower load (i.e.…”